Unit 9. Plane Geometry Concepts

  1. Angle relationships

    • Sum of the angles of a triangle
    • Angles in polygon
    • Angles in a circumference
      • Central angles. 
        • LivePDF - 
      • Inscribed angle
        • Quiz - 

  2. Similar triangles

    • Definition
    • Thales’s theorem
    • Triangles in Thales’s position
    •  Similar triangles criterion

  3. Scales

  4. Pythagoream theorem

    • Applications

  5. Areas of curved shapes